Congrats! I used to load & carry my Outback on my sedan, here're 2 videos of technique that I adapted:
https://www.youtube.com/watch?v=6wnzk1VOJa0
https://www.youtube.com/watch?v=s7gQKKBV648
btw, good thing that you're getting a roof rack, cuz foam blocks only protects the paint but you'll dent the roof if tighten too much (learned from my mistake). also, always tie down the front/back of yak to add stability.
Hope this helps!